Your mother and father were one of Gensoukyou's many couples, they were very committed to each other.You listen too, Marisa.However, for a long time, they couldn't have any children. You must have also heard of this, yes?However, a newborn with thick blood would bring with it many diseases and furthermore, causing deep wounds on the mother's body.
Polycythemia in the NewbornI know you're there.But no, to be more accurate.The talent in magic is mostly determined by natural lineage.No matter how many times they had children, they would become useless. Because their blood is too thick.